CN112032915A - Air conditioner and control method thereof - Google Patents
Air conditioner and control method thereof Download PDFInfo
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- CN112032915A CN112032915A CN202010857227.3A CN202010857227A CN112032915A CN 112032915 A CN112032915 A CN 112032915A CN 202010857227 A CN202010857227 A CN 202010857227A CN 112032915 A CN112032915 A CN 112032915A
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- 238000000034 method Methods 0.000 title claims abstract description 37
- 230000001105 regulatory effect Effects 0.000 claims abstract description 116
- 239000007788 liquid Substances 0.000 claims abstract description 56
- 230000008020 evaporation Effects 0.000 claims abstract description 22
- 238000001704 evaporation Methods 0.000 claims abstract description 22
- 239000003507 refrigerant Substances 0.000 claims description 20
- 230000001276 controlling effect Effects 0.000 claims description 10
- 238000002474 experimental method Methods 0.000 claims description 6
- 230000029058 respiratory gaseous exchange Effects 0.000 claims description 4
- 238000000926 separation method Methods 0.000 description 6
- 238000004378 air conditioning Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000005514 two-phase flow Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/88—Electrical aspects, e.g. circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
- F24F5/001—Compression cycle type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/10—Pressure
- F24F2140/12—Heat-exchange fluid pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
Abstract
The invention discloses an air conditioner and a control method thereof, wherein the air conditioner is provided with a flow regulating valve, an evaporation module and a branch temperature/pressure acquisition module on a parallel branch, the branch state data Ti of each branch is acquired by the branch temperature/pressure acquisition module, the compressor air suction state data K is acquired by the compressor air suction temperature/pressure acquisition module, the opening degree of the corresponding flow regulating valve is controlled according to the relation between the compressor air suction state data K and the optimal interval [ A, B ] of the compressor air suction temperature/pressure, the relation between the difference value between the compressor air suction state data K and the branch state data Ti and the optimal interval [ C, D ] of the difference value between the compressor air suction state data K and the branch state data Ti, the flow entering an evaporator is relatively uniform, the condition of uneven frosting of a fin heat exchanger is improved, and meanwhile, the safe compressor air suction, the air suction port of the compressor is guaranteed not to carry liquid, and the service life of the compressor is guaranteed.
Description
Technical Field
The invention belongs to the technical field of air conditioning, and particularly relates to an air conditioner and a control method thereof.
Background
At present, fin evaporators are the most main application type in large and medium-sized air-cooled heat pump units. When the heat pump unit is in heating operation in winter, the fin heat exchanger is used as an evaporator, and a liquid separator at the inlet of the evaporator divides the throttled refrigerant into a plurality of flows to be distributed to the evaporator to complete evaporation. The performance of the liquid separator directly affects the flow of refrigerant to the evaporator circuits. On one hand, the refrigerant in the pipe is required to have certain flow velocity so as to achieve certain heat exchange coefficient; on the other hand, the surface of the evaporator is required to be frosted uniformly so as to keep the heat exchange coefficient uniform. If the performance of the liquid separator is poor, the flow of some processes of the evaporator is too small, so that the processes are seriously overheated and the heat exchanger is wasted; meanwhile, the flow of other flows is larger, the refrigerant is not evaporated sufficiently, the performance of the fin heat exchanger is deteriorated, the frosting property is influenced, the frosting degree of each fin is different, some fins are not frosted, and some fins are completely frosted.
In order to improve the uniformity of liquid separation, the existing liquid separator is additionally provided with a pore plate structure at the inlet end, the pressure of a refrigerant is reduced by the pressure drop of the pore plate, the flow rate is increased, and a cone with the flow dividing function is arranged behind the pore plate, so that gas-liquid two-phase flow flowing out of an expansion valve is uniformly distributed to each flow hole beside the cone, the balance of the mixing state is kept by the on-way resistance of a capillary tube at the rear end of the liquid separator, and the method is taken by most of air-cooled heat pump units for achieving uniform liquid separation at present.
Especially for large air-cooled heat pump units, the number of rows of refrigerant pipes in the evaporator is large, so that the refrigerant flow rate specifically distributed to each pipeline always has deviation, the pipes with large flow rate difference are not completely evaporated by considering the uneven air flow rate or other reasons, the heat exchange rate of the pipes is correspondingly lowered, the difference of frosting degrees on the rib pipes of the heat exchanger is large in actual test, some pipelines are not frosted, some pipelines are frosted, and the compressor can absorb air to carry liquid seriously, so that the performance of the compressor is influenced. Therefore, the problems of uneven liquid distribution of the evaporator, low efficiency of the evaporator, or excessive resistance which causes too high discharge pressure of the compressor, and even liquid return and the like due to the design, processing and other factors of the liquid distributor cannot be solved well on the premise that the design of the liquid distribution head cannot be optimized continuously.
The above information disclosed in this background section is only for enhancement of understanding of the background of the application and therefore it may comprise prior art that does not constitute known to a person of ordinary skill in the art.
Disclosure of Invention
The invention provides an air conditioner and a control method thereof, aiming at solving the technical problems of uneven liquid separation of an evaporator and liquid entrainment of air suction of a compressor of the air conditioner.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
the control method of the air conditioner comprises a compressor, a condenser, a throttling device, a liquid distributor, a plurality of parallel branches, a compressor air suction temperature/pressure acquisition module and a compressor which are sequentially connected through refrigerant pipelines, wherein the parallel branches are sequentially provided with a flow regulating valve, an evaporation module and a branch temperature/pressure acquisition module, and the control method comprises the following steps:
a branch temperature/pressure acquisition module on the ith branch acquires state data Ti of the ith branch, wherein i =1, 2, … and the number of parallel branches; the compressor air suction temperature/pressure acquisition module acquires air suction state data K of the compressor;
obtaining an optimal interval [ A, B ] of the suction temperature/pressure of the compressor, and obtaining an optimal interval [ C, D ] of the suction temperature/pressure of the compressor and the outlet temperature/pressure difference of the evaporation module;
controlling the opening degree of the flow regulating valve of the corresponding ith branch according to the relation between the compressor suction state data K and the interval [ A, B ], the relation between the difference value between the compressor suction state data K and the branch state data Ti and the interval [ C, D ];
the optimal intervals [ A, B ] and [ C, D ] are intervals which are determined in advance through experiments and can ensure that all evaporation modules are uniformly distributed with liquid and the compressor sucks air without liquid.
In the control method of the air conditioner, when K > B, if K-Ti < C, the flow regulating valve of the ith branch keeps the initial opening N; if C is less than K-Ti is less than D, the flow regulating valve of the ith branch keeps the initial opening N; if K-Ti > D, reducing the opening degree of the flow regulating valve of the ith branch until C < K-Ti < D;
when K is less than A, if K-Ti is less than C, the opening degree of the flow regulating valve of the ith branch is increased until C is less than K-Ti is less than D; if C is less than K-Ti is less than D, the flow regulating valve of the ith branch keeps the initial opening N; if K-Ti > D, reducing the opening degree of the flow regulating valve of the ith branch until C < K-Ti < D;
when A is less than K and less than B, if K-Ti is less than C, the opening degree of the flow regulating valve of the ith branch is increased until C is less than K-Ti and less than D; if C is less than K-Ti is less than D, the flow regulating valve of the ith branch keeps the initial opening N; if K-Ti > D, reducing the opening degree of the flow regulating valve of the ith branch until C < K-Ti < D;
wherein, when C is less than K-Ti is less than D, A is less than K and less than B.
In the control method of the air conditioner as described above, the adjustment rate of the flow rate adjustment valve at K < a is greater than the adjustment rate at a < K < B.
In the control method of the air conditioner, the larger the difference between the K-Ti and the C, D is, the larger the adjustment rate of the flow rate adjusting valve is.
According to the control method of the air conditioner, the difference value between the K-Ti and the C, D is provided with a plurality of intervals, each interval corresponds to one flow regulating valve regulating rate, the regulating rate of the flow regulating valve corresponding to the interval to which the difference value between the K-Ti and the C, D belongs is obtained, and the opening degree of the flow regulating valve of the ith branch is regulated according to the regulating rate.
An air conditioner comprises a compressor, a condenser, a throttling device, a liquid distributor, a plurality of parallel branches, a compressor suction temperature/pressure acquisition module and a compressor which are sequentially connected through refrigerant pipelines, wherein a flow regulating valve, an evaporation module and a branch temperature/pressure acquisition module are sequentially arranged on each parallel branch, and the branch temperature/pressure acquisition module on the ith branch is used for acquiring state data Ti of the ith branch, wherein i =1, 2, … and the number of the parallel branches; the compressor temperature/pressure collection module of breathing in is used for gathering compressor state data K of breathing in, its characterized in that, the air conditioner still includes:
the storage module is used for storing an optimal interval [ A, B ] of the suction temperature/pressure of the compressor and an optimal interval [ C, D ] of the suction temperature/pressure of the compressor and the outlet temperature/pressure difference of the evaporation module;
the control module is used for controlling the opening degree of the flow regulating valve of the corresponding ith branch according to the relation between the compressor suction state data K and the interval [ A, B ], the relation between the difference value between the compressor suction state data K and the branch state data Ti and the interval [ C, D ];
the optimal intervals [ A, B ] and [ C, D ] are intervals which are determined in advance through experiments and can ensure that all evaporation modules are uniformly distributed with liquid and the compressor sucks air without liquid.
In the air conditioner, the control module is configured to, when K > B, if K-Ti < C, maintain the initial opening N of the flow regulating valve of the ith branch; if C is less than K-Ti is less than D, the flow regulating valve of the ith branch keeps the initial opening N; if K-Ti > D, reducing the opening degree of the flow regulating valve of the ith branch until C < K-Ti < D;
when K is less than A, if K-Ti is less than C, the opening degree of the flow regulating valve of the ith branch is increased until C is less than K-Ti is less than D; if C is less than K-Ti is less than D, the flow regulating valve of the ith branch keeps the initial opening N; if K-Ti > D, reducing the opening degree of the flow regulating valve of the ith branch until C < K-Ti < D;
when A is less than K and less than B, if K-Ti is less than C, the opening degree of the flow regulating valve of the ith branch is increased until C is less than K-Ti and less than D; if C is less than K-Ti is less than D, the flow regulating valve of the ith branch keeps the initial opening N; if K-Ti > D, reducing the opening degree of the flow regulating valve of the ith branch until C < K-Ti < D;
wherein, when C is less than K-Ti is less than D, A is less than K and less than B.
The control module is used for controlling the adjusting rate of the flow regulating valve when K < A to be larger than the adjusting rate when A < K < B.
In the control method of the air conditioner, the control module is used for controlling the adjusting rate of the flow regulating valve to be larger when the difference value between the K-Ti and the C, D is larger.
In the control method of the air conditioner, the storage module stores a difference between K-Ti and C, D and is provided with a plurality of intervals, each interval corresponds to a flow regulating valve adjusting rate, and the control module is configured to obtain the flow regulating valve adjusting rate corresponding to the interval to which the difference between K-Ti and C, D belongs, and adjust the opening of the flow regulating valve of the ith branch according to the adjusting rate.
Compared with the prior art, the invention has the advantages and positive effects that: the invention is provided with a flow regulating valve, an evaporation module and a branch temperature/pressure acquisition module on a parallel branch, acquires branch state data Ti of each branch through the branch temperature/pressure acquisition module, acquires compressor suction state data K through the compressor suction temperature/pressure acquisition module, controls the opening of the corresponding flow regulating valve to regulate the flow according to the relationship between the compressor suction state data K and the optimal interval [ A, B ] of the compressor suction temperature/pressure, the relationship between the difference value between the compressor suction state data K and the branch state data Ti and the optimal interval [ C, D ] of the difference value between the compressor suction state data K and the branch state data Ti until the minimum allowance is reached, so that the flow entering an evaporator is relatively uniform, avoids uneven liquid distribution caused by flow path design and the like, greatly improves the heat exchange coefficient of the evaporator, and improves the condition of uneven frost formation of a fin heat exchanger, meanwhile, the air suction temperature/pressure of the safe compressor is guaranteed, no liquid is brought at the air suction port of the compressor, and the service life of the compressor is guaranteed.
Other features and advantages of the present invention will become more apparent from the following detailed description of the invention when taken in conjunction with the accompanying drawings.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic view of an air conditioning refrigeration system according to an embodiment of the present invention.
Fig. 2 is a flowchart illustrating a method for controlling an air conditioner in a heating state according to an embodiment of the present invention.
Fig. 3 is a schematic block diagram of an air conditioner according to an embodiment of the present invention.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention.
The embodiment provides a control method of an air conditioner, the temperature/pressure of the outlet of an evaporator of each branch is collected through a branch temperature/pressure collection module, the temperature/pressure of the air suction port of a compressor is collected through a compressor air suction temperature/pressure collection module, the opening degree of a corresponding flow regulating valve is controlled according to the relation between compressor air suction state data K and the optimal interval [ A, B ] of the compressor air suction temperature/pressure, the relation between the difference value between the compressor air suction state data K and the branch state data Ti and the optimal interval [ C, D ] of the difference value, the flow is regulated, the flow entering the evaporator is uniform, the safe compressor air suction temperature/pressure is guaranteed, the condition that liquid is not carried at the air suction port of the compressor is guaranteed, and the service life of the compressor is guaranteed.
The air conditioner comprises a compressor, a condenser, a throttling device, a liquid distributor, a plurality of parallel branches, a compressor air suction temperature/pressure acquisition module and a compressor which are sequentially connected through refrigerant pipelines, wherein a flow regulating valve, an evaporation module and a branch temperature/pressure acquisition module are sequentially arranged on the parallel branches.
Specifically, as shown in fig. 1, the air conditioner of the present embodiment includes: the system comprises a compressor 1, a finned heat exchanger (evaporator) 2, a shell-and-tube heat exchanger (condenser) 3, a fan 4, a main liquid circuit electronic expansion valve 5, a liquid separator 6, a liquid separator rear capillary tube, a branch flow regulating valve 8, a branch temperature/pressure acquisition module 9, a compressor suction temperature/pressure acquisition module 10 and a gas-liquid separator 11.
The circulation flow when the unit heats is as follows: compressor 1 → shell and tube heat exchanger 3 → main circuit electronic expansion valve 5 → liquid separator 6 → rear capillary tube 7 of liquid separator → branch flow rate adjusting valve 8 → finned heat exchanger 2 → branch temperature/pressure acquisition module 9 → gas-liquid separator 11 → compressor suction temperature/pressure acquisition module 10 → compressor 1.
The heating working principle of the air conditioning unit of the embodiment is as follows: the refrigerant of the unit becomes high-pressure gas after passing through the compressor 1, the high-pressure gas enters the shell-and-tube heat exchanger 3 after passing through the four-way valve, the refrigerant transfers heat to water in the shell-and-tube heat exchanger 3, the refrigerant enters the liquid separator 6 for liquid separation after throttling and speed regulating by the main circuit electronic expansion valve 4, the flow entering each branch is as equal as possible, the refrigerant enters the liquid separator after liquid separation by the liquid separator 6 and then is further atomized by the capillary tube 7, the gas-liquid two-phase mixture is uniformly mixed, and then enters the branch flow regulating valve 8 corresponding to each branch, the uniformly distributed two-phase flow mixture enters the refrigerant tube of the fin type heat exchanger 2 after passing through the valve, the refrigerant absorbs heat from the low-temperature environment by the fan 4 in the fin type heat exchanger 2, the evaporation process is completed, and the temperature/pressure of the outlet pipe of each branch evaporator can be obtained by the branch, then enters the gas-liquid separator 11, the liquid which is partially not completely evaporated under the action of gravity is left at the bottom of the container, and the gas enters the compressor 1 through a compressor suction pipeline to perform the pressurization cycle process again.
The control method of the embodiment comprises the following steps:
and a branch temperature/pressure acquisition module on the ith branch acquires the state data Ti of the ith branch, wherein i =1, 2 and …, and the number of the parallel branches is equal to or less than the total number of the branch temperature/pressure acquisition module on the ith branch.
And the compressor air suction temperature/pressure acquisition module acquires air suction state data K of the compressor.
The method comprises the steps of obtaining an optimal interval [ A, B ] of the suction temperature/pressure of the compressor, and obtaining an optimal interval [ C, D ] of the suction temperature/pressure of the compressor and the outlet temperature/pressure difference of an evaporation module, wherein the optimal intervals [ A, B ] and [ C, D ] are intervals which are determined in advance through experiments and can ensure that liquid of all evaporation modules is uniformly distributed and liquid is not carried in the suction of the compressor, and when C is less than K-Ti is less than D, A is less than K and less than B.
And controlling the opening degree of the flow regulating valve of the corresponding ith branch according to the relation between the compressor suction state data K and the interval [ A, B ], and the relation between the difference value between the compressor suction state data K and the branch state data Ti and the interval [ C, D ].
Specifically, the method comprises the following steps:
1. when K > B:
and if K-Ti is less than C, the flow regulating valve of the ith branch keeps the initial opening N.
Since K is greater than B, K-Ti < C, it indicates that Ti temperature is very high, refrigerant flow in unit time is too large, heat exchange is insufficient, liquid supply is too much, and the flow regulating valve should be reduced. However, since the actual suction temperature K of the compressor is greater than the saturation temperature or the upper limit B of the reasonably optimal temperature interval in the current operating condition, if the flow rate is further reduced, the value of K is greater. Under a certain working condition, [ A, B ] is determined, the air suction temperature of the unit is more seriously deviated due to the fact that the opening degree of the flow regulating valve is continuously reduced, so that the adjustment is not carried out, the air suction temperature of the compressor also belongs to an oversaturated state at the moment, the liquid carrying problem is avoided, and therefore the air suction temperature can be continuously maintained at the current flow rate or the current opening degree.
And if C is less than K-Ti and less than D, the flow regulating valve of the ith branch keeps the initial opening degree N.
And if K-Ti > D, reducing the opening degree of the flow regulating valve of the ith branch until C < K-Ti < D.
2. When K < A:
and if K-Ti is less than C, increasing the opening degree of the flow regulating valve of the ith branch until C is less than K-Ti is less than D.
And if C is less than K-Ti and less than D, the flow regulating valve of the ith branch keeps the initial opening degree N.
And if K-Ti > D, reducing the opening degree of the flow regulating valve of the ith branch until C < K-Ti < D.
3. When a < K < B:
and if K-Ti is less than C, increasing the opening degree of the flow regulating valve of the ith branch until C is less than K-Ti is less than D.
And if C is less than K-Ti and less than D, the flow regulating valve of the ith branch keeps the initial opening degree N.
And if K-Ti > D, reducing the opening degree of the flow regulating valve of the ith branch until C < K-Ti < D.
Preferably, the adjusting rate of the flow regulating valve when K < A is greater than that when A < K < B, so as to achieve the effect of uniform liquid separation as soon as possible.
Further, the larger the difference between K-Ti and C, D is, the larger the adjusting speed of the flow regulating valve is, so as to further accelerate the effect of uniform liquid distribution.
Preferably, the difference value between the K-Ti and the C, D is provided with a plurality of intervals, each interval corresponds to one flow regulating valve regulating rate, the regulating rate of the flow regulating valve corresponding to the interval to which the difference value between the K-Ti and the C, D belongs is obtained, and the opening degree of the flow regulating valve of the ith branch is regulated according to the regulating rate.
As shown in fig. 2, the air conditioner control method of the present embodiment specifically includes the following steps:
s1, obtaining intervals [ A, B ] and [ C, D ].
S2, branch temperature/pressure acquisition modules on all branches acquire state data Ti of the branches, and a compressor air suction temperature/pressure acquisition module acquires air suction state data K of the compressor.
S3, K > B, the process proceeds to step S4, otherwise, the process proceeds to step S10.
S4, K-Ti < C, go to step S5, otherwise go to step S6.
And S5, keeping the initial opening degree N of the flow regulating valve of the ith branch.
S6, C < K-Ti < D, and step S7, otherwise, step S8.
And S7, keeping the initial opening degree N of the flow regulating valve of the ith branch.
S8, K-Ti > D, and the flow proceeds to step S9.
And S9, reducing the opening degree of the flow regulating valve of the ith branch until C is less than K-Ti is less than D.
S10, K < a, and proceeds to step S11, otherwise, proceeds to step S17.
S11, K-Ti < C, go to step S12, otherwise go to step S13.
And S12, increasing the opening degree of the flow regulating valve of the ith branch until C is less than K-Ti is less than D.
S13, C < K-Ti < D, and step S14, otherwise, step S15.
And S14, keeping the initial opening degree N of the flow regulating valve of the ith branch.
S15, if K-Ti > D, the process goes to step S16.
And S16, reducing the opening degree of the flow regulating valve of the ith branch until C is less than K-Ti is less than D.
S17, a < K < B, and the process advances to step S18.
S18, K-Ti < C, go to step S19, otherwise go to step S20.
And S19, increasing the opening degree of the flow regulating valve of the ith branch until C is less than K-Ti is less than D.
S20, C < K-Ti < D, and step S21, otherwise, step S22.
And S21, keeping the initial opening degree N of the flow regulating valve of the ith branch.
S22, if K-Ti > D, the process goes to step S23.
And S23, reducing the opening degree of the flow regulating valve of the ith branch until C is less than K-Ti is less than D.
An air conditioner comprises a compressor, a condenser, a throttling device, a liquid distributor, a plurality of parallel branches, a compressor suction temperature/pressure acquisition module and a compressor which are sequentially connected through refrigerant pipelines, wherein a flow regulating valve, an evaporation module and a branch temperature/pressure acquisition module are sequentially arranged on the parallel branches, and the branch temperature/pressure acquisition module on the ith branch is used for acquiring state data Ti of the ith branch, wherein i =1, 2, … and the number of the parallel branches; the compressor air suction temperature/pressure acquisition module is used for acquiring air suction state data K of the compressor.
As shown in fig. 3, the air conditioner further includes:
and the storage module is used for storing the optimal interval [ A, B ] of the suction temperature/pressure of the compressor and the optimal interval [ C, D ] of the suction temperature/pressure of the compressor and the outlet temperature/pressure difference of the evaporation module.
And the control module is used for controlling the opening degree of the corresponding flow regulating valve of the ith branch according to the relation between the compressor suction state data K and the interval [ A, B ], and the relation between the difference value between the compressor suction state data K and the branch state data Ti and the interval [ C, D ]. The optimal intervals [ A, B ] and [ C, D ] are intervals which are determined in advance through experiments and can ensure that all evaporation modules are uniformly distributed with liquid and the compressor sucks air without liquid.
Specifically, the control module is used for keeping the flow regulating valve of the ith branch at an initial opening N when K is greater than B and K-Ti is less than C; if C is less than K-Ti is less than D, the flow regulating valve of the ith branch keeps the initial opening N; and if K-Ti > D, reducing the opening degree of the flow regulating valve of the ith branch until C < K-Ti < D.
When K is less than A, if K-Ti is less than C, the opening degree of the flow regulating valve of the ith branch is increased until C is less than K-Ti is less than D; if C is less than K-Ti is less than D, the flow regulating valve of the ith branch keeps the initial opening N; and if K-Ti > D, reducing the opening degree of the flow regulating valve of the ith branch until C < K-Ti < D.
When A is less than K and less than B, if K-Ti is less than C, the opening degree of the flow regulating valve of the ith branch is increased until C is less than K-Ti and less than D; if C is less than K-Ti is less than D, the flow regulating valve of the ith branch keeps the initial opening N; and if K-Ti > D, reducing the opening degree of the flow regulating valve of the ith branch until C < K-Ti < D.
Wherein, when C is less than K-Ti is less than D, A is less than K and less than B.
The control module is also used for controlling the adjusting speed of the flow adjusting valve when K is smaller than A to be larger than the adjusting speed when A is smaller than K and smaller than B, so that the adjusting efficiency is improved.
The control module is further configured to control the flow regulator valve to adjust at a greater rate when the difference between K-Ti and C, D is greater to increase the efficiency of the adjustment.
Specifically, the storage module stores a difference value between K-Ti and C, D and is provided with a plurality of intervals, each interval corresponds to a flow regulating valve regulating rate, the control module is used for obtaining the flow regulating valve regulating rate corresponding to the interval to which the difference value between K-Ti and C, D belongs, and the opening degree of the flow regulating valve of the ith branch is regulated according to the regulating rate.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions.
Claims (10)
1. The control method of the air conditioner comprises a compressor, a condenser, a throttling device, a liquid distributor, a plurality of parallel branches, a compressor air suction temperature/pressure acquisition module and a compressor which are sequentially connected through refrigerant pipelines, wherein the parallel branches are sequentially provided with a flow regulating valve, an evaporation module and a branch temperature/pressure acquisition module, and the control method is characterized by comprising the following steps of:
a branch temperature/pressure acquisition module on the ith branch acquires state data Ti of the ith branch, wherein i =1, 2, … and the number of parallel branches; the compressor air suction temperature/pressure acquisition module acquires air suction state data K of the compressor;
obtaining an optimal interval [ A, B ] of the suction temperature/pressure of the compressor, and obtaining an optimal interval [ C, D ] of the suction temperature/pressure of the compressor and the outlet temperature/pressure difference of the evaporation module;
controlling the opening degree of the flow regulating valve of the corresponding ith branch according to the relation between the compressor suction state data K and the interval [ A, B ], the relation between the difference value between the compressor suction state data K and the branch state data Ti and the interval [ C, D ]
The optimal intervals [ A, B ] and [ C, D ] are intervals which are determined in advance through experiments and can ensure that all evaporation modules are uniformly distributed with liquid and the compressor sucks air without liquid.
2. The control method of an air conditioner according to claim 1, wherein, when K > B, if K-Ti < C, the flow rate adjustment valve of the ith branch maintains an initial opening degree N; if C is less than K-Ti is less than D, the flow regulating valve of the ith branch keeps the initial opening N; if K-Ti > D, reducing the opening degree of the flow regulating valve of the ith branch until C < K-Ti < D;
when K is less than A, if K-Ti is less than C, the opening degree of the flow regulating valve of the ith branch is increased until C is less than K-Ti is less than D; if C is less than K-Ti is less than D, the flow regulating valve of the ith branch keeps the initial opening N; if K-Ti > D, reducing the opening degree of the flow regulating valve of the ith branch until C < K-Ti < D;
when A is less than K and less than B, if K-Ti is less than C, the opening degree of the flow regulating valve of the ith branch is increased until C is less than K-Ti and less than D; if C is less than K-Ti is less than D, the flow regulating valve of the ith branch keeps the initial opening N; if K-Ti > D, reducing the opening degree of the flow regulating valve of the ith branch until C < K-Ti < D;
wherein, when C is less than K-Ti is less than D, A is less than K and less than B.
3. The control method of an air conditioner according to claim 2, wherein the adjustment rate of the flow rate adjustment valve at K < a is greater than the adjustment rate at a < K < B.
4. The control method of an air conditioner according to claim 2, wherein the larger the difference between the K-Ti and C, D, the larger the adjustment rate of the flow rate adjustment valve.
5. The method as claimed in claim 4, wherein the difference between K-Ti and C, D is provided with a plurality of intervals, each interval corresponds to a flow regulating valve adjusting rate, the flow regulating valve adjusting rate corresponding to the interval to which the difference between K-Ti and C, D belongs is obtained, and the opening degree of the flow regulating valve of the ith branch is adjusted according to the adjusting rate.
6. An air conditioner is characterized by comprising a compressor, a condenser, a throttling device, a liquid distributor, a plurality of parallel branches, a compressor suction temperature/pressure acquisition module and a compressor which are sequentially connected through refrigerant pipelines, wherein the parallel branches are sequentially provided with a flow regulating valve, an evaporation module and a branch temperature/pressure acquisition module, the branch temperature/pressure acquisition module on the ith branch is used for acquiring state data Ti of the ith branch, and i =1, 2, … and the number of the parallel branches; the compressor temperature/pressure collection module of breathing in is used for gathering compressor state data K of breathing in, its characterized in that, the air conditioner still includes:
the storage module is used for storing an optimal interval [ A, B ] of the suction temperature/pressure of the compressor and an optimal interval [ C, D ] of the suction temperature/pressure of the compressor and the outlet temperature/pressure difference of the evaporation module;
the control module is used for controlling the opening degree of the flow regulating valve of the corresponding ith branch according to the relation between the compressor suction state data K and the interval [ A, B ], the relation between the difference value between the compressor suction state data K and the branch state data Ti and the interval [ C, D ];
the optimal intervals [ A, B ] and [ C, D ] are intervals which are determined in advance through experiments and can ensure that all evaporation modules are uniformly distributed with liquid and the compressor sucks air without liquid.
7. The air conditioner according to claim 6, wherein the control module is configured to maintain the flow regulating valve of the ith branch at an initial opening degree N if K-Ti < C when K > B; if C is less than K-Ti is less than D, the flow regulating valve of the ith branch keeps the initial opening N; if K-Ti > D, reducing the opening degree of the flow regulating valve of the ith branch until C < K-Ti < D;
when K is less than A, if K-Ti is less than C, the opening degree of the flow regulating valve of the ith branch is increased until C is less than K-Ti is less than D; if C is less than K-Ti is less than D, the flow regulating valve of the ith branch keeps the initial opening N; if K-Ti > D, reducing the opening degree of the flow regulating valve of the ith branch until C < K-Ti < D;
when A is less than K and less than B, if K-Ti is less than C, the opening degree of the flow regulating valve of the ith branch is increased until C is less than K-Ti and less than D; if C is less than K-Ti is less than D, the flow regulating valve of the ith branch keeps the initial opening N; if K-Ti > D, the opening degree of the flow regulating valve of the ith branch is reduced until C < K-Ti < D
Wherein, when C is less than K-Ti is less than D, A is less than K and less than B.
8. The air conditioner of claim 7, wherein the control module is configured to control the flow control valve to adjust at a greater rate at K < a than at a < K < B.
9. The control method of an air conditioner according to claim 8, wherein the control module is configured to control the regulation rate of the flow rate regulation valve to be larger as the difference between the K-Ti and C, D is larger.
10. The method as claimed in claim 9, wherein the storage module stores a plurality of intervals, each interval corresponding to a flow control valve adjusting rate, for storing the difference between K-Ti and C, D, and the control module is configured to obtain the flow control valve adjusting rate corresponding to the interval to which the difference between K-Ti and C, D belongs, and adjust the opening degree of the flow control valve of the ith branch according to the adjusting rate.
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| CN202010857227.3A CN112032915A (en) | 2020-08-24 | 2020-08-24 | Air conditioner and control method thereof |
| PCT/CN2021/091832 WO2021223697A1 (en) | 2020-08-24 | 2021-05-06 | Air conditioner and control method thereof |
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| WO2021223697A1 (en) * | 2020-08-24 | 2021-11-11 | 青岛海尔空调电子有限公司 | Air conditioner and control method thereof |
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| CN115751590A (en) * | 2022-11-10 | 2023-03-07 | 宁波奥克斯电气股份有限公司 | Compressor exhaust pressure control method and device, air conditioner and storage medium |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000074504A (en) * | 1998-08-28 | 2000-03-14 | Fujitsu General Ltd | Method and device for controlling air conditioner |
| CN101109592A (en) * | 2006-07-19 | 2008-01-23 | 乐金电子(天津)电器有限公司 | Temperature emergent state controlling means for air conditioner compressor air suction port |
| CN103017417A (en) * | 2011-09-26 | 2013-04-03 | 艾默生网络能源有限公司 | Evaporator system and evaporator flow control method |
| CN103216981A (en) * | 2013-04-28 | 2013-07-24 | 宁波沃弗圣龙环境技术有限公司 | Frostless air handling unit and proportion-integration-differential control method thereof |
| CN105509387A (en) * | 2014-10-09 | 2016-04-20 | 青岛海尔空调电子有限公司 | Air-cooled heat pump unit and openness control method of electronic expansion valve therein and air conditioner |
| CN105674650A (en) * | 2016-01-15 | 2016-06-15 | 珠海格力电器股份有限公司 | Finned evaporator and liquid distribution control method and device thereof |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104807229A (en) * | 2015-04-27 | 2015-07-29 | 广东美的暖通设备有限公司 | Multi-split air conditioner and control method thereof |
| CN107449078A (en) * | 2017-07-26 | 2017-12-08 | 美的集团武汉制冷设备有限公司 | Air-conditioning system, the control device of air-conditioning system and method |
| CN112032915A (en) * | 2020-08-24 | 2020-12-04 | 青岛海尔空调电子有限公司 | Air conditioner and control method thereof |
-
2020
- 2020-08-24 CN CN202010857227.3A patent/CN112032915A/en active Pending
-
2021
- 2021-05-06 WO PCT/CN2021/091832 patent/WO2021223697A1/en active Application Filing
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000074504A (en) * | 1998-08-28 | 2000-03-14 | Fujitsu General Ltd | Method and device for controlling air conditioner |
| CN101109592A (en) * | 2006-07-19 | 2008-01-23 | 乐金电子(天津)电器有限公司 | Temperature emergent state controlling means for air conditioner compressor air suction port |
| CN103017417A (en) * | 2011-09-26 | 2013-04-03 | 艾默生网络能源有限公司 | Evaporator system and evaporator flow control method |
| CN103216981A (en) * | 2013-04-28 | 2013-07-24 | 宁波沃弗圣龙环境技术有限公司 | Frostless air handling unit and proportion-integration-differential control method thereof |
| CN105509387A (en) * | 2014-10-09 | 2016-04-20 | 青岛海尔空调电子有限公司 | Air-cooled heat pump unit and openness control method of electronic expansion valve therein and air conditioner |
| CN105674650A (en) * | 2016-01-15 | 2016-06-15 | 珠海格力电器股份有限公司 | Finned evaporator and liquid distribution control method and device thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021223697A1 (en) * | 2020-08-24 | 2021-11-11 | 青岛海尔空调电子有限公司 | Air conditioner and control method thereof |
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